SimonMiddlemiss wrote:Ok, so I've just spent 3 days trying to figure out what on earth had happened to my Resolve experience. Turns out someone who was working on the project with me rendered out an image montage at the native resolution of the images which was 11k x 11k.
FYI if you have Fusion compositions directly on a clip - a "single-clip composition", where you put the playhead over a media file on Edit and then go to the Fusion page, or right-click and "Open In Fusion Page" - then Fusion sees the media at its full resolution, irrespective of the current timeline resolution.
By contrast, making a Fusion Clip from the media file(s) would first scale that media to timeline resolution before passing it to Fusion.
Therefore, in situations where there's media of a much higher resolution than the timeline, having a single-clip Fusion composition can cause a massive performance difference versus making a Fusion Clip of the media first.
So, assuming you did indeed have single-clip compositions on 11k media, that would certainly explain why performance tanked. If 11K media isn't needed then it's definitely better to use a lower resolution, but if any higher resolution is needed and a Fusion comp is being used, it might be worth considering (for the future) to make a Fusion Clip as this will cause the media to be scaled by Resolve before Fusion does its processing on it. This can significantly improve performance whenever media is higher resolution than the timeline it's on. Of course it also means that Fusion can't pan around in its full resolution.